What is the purpose of the Android 'KeyguardManager'? MCQ with Answer and Explanation

Question
What is the purpose of the Android 'KeyguardManager'?
A. To manage biometric authentication
B. To handle screen locking
C. To manage device passwords
D. To manage the lock screen and keyguard state
Answer: Option D
Solution (By JKSSB Mock Tests)
KeyguardManager controls the lock screen (keyguard) and allows apps to disable the keyguard temporarily.
This question belongs to: Computer Operating Systems
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Practice More Operating Systems Questions

Question #1
In Windows, the 'System File Checker' (SFC) is used to:
A. Update system drivers
B. Check disk integrity
C. Restore system settings
D. Scan and repair corrupted system files
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Correct Answer: Option D

Explanation:
sfc /scannow verifies the integrity of protected system files and replaces incorrect versions.
This question belongs to: Computer Operating Systems
Question #2
In Android, which component allows an app to run in the background even when the user is not interacting with it?
A. Service
B. Content Provider
C. Broadcast Receiver
D. Activity
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Correct Answer: Option A

Explanation:
Services are designed for background operations without a UI, like playing music or downloading files.
This question belongs to: Computer Operating Systems
Question #3
Which component of the Linux operating system translates user terminal text commands directly into specific actions understood by the kernel?
A. GUI Desktop
B. Compiler
C. Shell
D. BIOS
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Correct Answer: Option C

Explanation:
The shell is a specialized command-line interpreter program that accepts text inputs from the user and executes system commands via the kernel.
This question belongs to: Computer Operating Systems
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